Padlock.



G. A. LUTZ.

PADLOOK. APPLICATION FILED MAY 3, 1909.

944,888. Patented Dec.28,1909.

WITNESSES: I I INVENTOR.

811 C4 4 W/ W (a ATTORNEY.

ANDREW & GRAHAM cc PNOYO-LITIIOBRAPHERS. WASNl-NOTON. n. a

nn STATES PATENT oniuon CHARLES ALBERT LUTZ, OF LANSING, MICHIGAN.

IPADLOCK.

SM LSSS.

Specification of Letters Patent.

Patented Dec. 28, 1909.

Application filed May 3, 1909. Serial No. 493,623.

To all whom it may concern:

Be it known that 1, CHARLES ALBERT LU'rz, a citizen of the UnitedStates, residing at Lansing, in the county of Ingham and State ofMichigan, have invented certain new and useful Improvements in Padlocks,of which the following is a specification.

My invent-ion relates to padlocks, and its object is to produce a light,easily manipulated lock, and one that shall be difficult to pick. Iattain these purposes by means of the device shown 1n the accompanyingdrawings, in which Figure 1 is a longitudinal elevation of my lock, themain body being in section. Fig. 5 is a view of the lock with the key inthe position in which the bolt is released, and the bolt itselfpartially withdrawn. Fig. 3 is a view of the key; and Fig. 4 is anelevation of the end plate, 2, of Fig. 1; and Fig. 2 is a similar viewof the locking plate, 13; and Fig. 6 is an elevation of the ward plate,14.

In the drawings, 1, represents the main body of the lock, which ispreferably of the longitudinal shape shown in the figure, theextremities having the cross-sectional form shown in Figs. 2 and 4. Butit is manifest that this shape might be altered in many ways withoutdeparting from my invention. The end of the device in which the key isinserted is closed by a plate, 2, having formed in it a keyhole, 3,which may be of any desired shape. The locking device is formed of threeparts, which may be integrally formed, or screwed together in anydesired manner, a head, 5, adapted to fit in the tube formed by theextremity, 6, of the body, 1, a bolt, 7, and a locking bar, 10.Openings, 8 and 9, are formed in the body, to receive the bolt, 7. Thebolt itself may be tapered as shown in Fig. 1, or as in Fig. 5, or ofany other desired form that will permit its introduction into theopenings intended to receive it. One or more locking springs, 11, areattached at or near the extremity of the locking bar, 10, adapted whencompressed to pass through an opening, 12, in a locking plate, 13. Thisopening, 12, may be of any desired form adapted to permit the passage ofthe springs, 11. If desired, in order to secure additional safetyagainst picking, a ward-plate, 14, may be inserted, having in it anopening, 15, of

any desired form, as-shown in Fig. 6, and the outer edge of the bentextremity, 16, of the key, 19, may be adapted to fit this opening, asshown in Fig. 6. A bolt remover, 17, is attached to the extremity of thelocking bar, 10. This piece may be if desired composed of the widenedextremity of one of the springs, 11. A groove, 18, is cut in the key,adapted to receive the bolt remover, 17. This groove extends back tosuch a distance that the key, 19, can pass inward far enough to compressthe springs, 11, so that they will pass through the opening, 12, beforeit will come in contact with the bolt remover, 17

The operation of the device is as follows: The lock is locked byinserting the bolt, 7, and the locking bar, 10, in the openings, 8 and12, respectively, and pushing the head inward until its outer extremitycomes flush with the end, 6, of the main body of the lock. The springs,11, will be compressed by the sides of the opening, 12, and will passthrough the opening. As soon as they have done so, they will springoutward and 0ccupy the positions shown in Fig. 1, The lock will then belocked and the bolt cannot be withdrawn. To unlock, the bent extremity,16, of the key, is inserted in the keyhole, 3, and pushed inward. Thekey will first pass through the opening, 15, which it cannot do unlessthe wards on the exterior of the extremity, 16, correspond to the shapeof the opening, 15. After passing through this it is then pushed inwarduntil the opening, 20, in the extremity, 16, of the key, passes over thelocking bar, 10, and compresses the springs, 11, sufficiently to passthrough the opening, 12. At this point, the bolt remover, 17, willengage with the extremity of the groove, 18. The springs, 11, havingbeen compressed so that they will pass through the opening, 12, theentire bolt and head will be pushed outward, as shown in Fig. 2, and canbe readily withdrawn.

I claim as my invention and desire to secure by Letters Patent:

1. In a lock, in combination, parallel bars, a spring mounted on one ofsaid bars, a main body provided with openings adapted to receive saidbars and spring, a removing member on one of said bars, an elongated keymember adapted at one end for releasing the spring to allow thewithdrawal of the bolt and spring through said openings, said key havingmeans intermediate its ends for engaging the removing member andwithdrawing the bolt.

2. In a lock, in combination, parallel bars, a spring mounted on one ofsaid bars, a main body provided with openings adapted to receive saidbars and spring, a removin lug on one of said bars adjacent the rear endof the spring, a key having a slotted portion adapted to pass over thelug to compress the spring and thereby release the bolt, the wall at therear end of the slotted portion of the key engaging said lug to removethe bolt.

8. In a lock, in combination, parallel bars, a spring mounted on one ofsaid bars, a main body provided with openings adapted to receive saidbars and spring, an offset bolt removing lug integral with said springand means for compressing said spring and engaging said lug to releaseand remove the bolt.

4. In a lock, in combination, parallel bars, a spring mounted on one ofsaid bars, and a recessed main body provided with openings adapted toreceive said bars and sprin means provided for compressing said springso that it will pass outwardly through an opening in said main body, anda wardplate located within said main body and provided with an openingadapted to fit said means for compressing said spring, substantially asdescribed.

In testimony whereof, I aflix my signature in presence of two witnesses.

CHARLES ALBERT LUTZ. -Witnesses WM. C. BROWN, EMMA G. OAVANAGH.

